This is to introduce the technology of weld patching in site for damaged or worn rail that Nanjing Track Maintenance Subdivision which involves making good the flaw preheating the spot to be welded post-weld grinding flaw detecting etc.

介绍南京工务段对伤损钢轨在现场进行快速 焊补的工艺，包括清除缺陷、对补焊位置 预热、焊补后磨平，并进行探伤检查等，取得了较好的效果。

In this case actions as necessary should be employed including proper weld repair process preheating and inter-layer temperature control to ensure good property of the pipe welded joint .

在进行补焊时，只有通过采用合理的 焊接方法、 预热、层间温度控制等措施，才能获得良好的焊缝性能。

Considering the characteristics of hydrogen stress corrosion a restoration plan was made especially in weld preheating post-weld heat treatment welding rod and plate selection . Therefore the hardness of the welding seam and heat - affected zone was reduced and residual stress was relieved .

结合氢应力腐蚀特点制定了修复方案，特别是 焊 前 预热、焊后热处理、选择合适的焊条及板材，降低了焊道和热影响区硬度，消除残余应力。

Research for Intensive Graphitizer Used in Welding Gray Cast with Same Weld Metal without Preheating

灰口铸铁同质 焊缝 冷焊用强石墨化焊剂的研究